Personally I'd enjoy still seeing photos posted here to help give the swap more visibility. The problem with only using frag swapper is that it doesn't provide the built in advertising that happens when you reply to a swap thread. Having been involved in swaps, forums, and advertising you need to be sure to get the word out for a swap to be successful.
I see it as a direct benefit to the sellers to use both forums and fragswapper to be more successful selling their items. By posting photos here, you are marketing your corals (advertising, if you will)...then fragswapper becomes your place to sell (reserve) the frags...like your own ecommerce site.
Keep in mind that fragswapper is more steps for people to go through...you want to get them interested enough on the forums to go over to fragswapper to see more and make their reservations. Many folks will just skip it, if there is more than a couple clicks involved and they don't see an item they want right in front of them.
I feel fragswapper is a great tool, which is why we sponsor fragswapper. Fragswapper really excels at helping keep track of swap pre-sales/purchases. However I feel there has been a growing trend where many buyers don't do the presales as much and tend to go to the swap and make their decisions after they see the frags displayed in tanks (something that is fairly new...it used to be bags in coolers). So swap attendees that aren't into presales are less likely to visit fragswapper...IMO.